It doesn't make sense, because “cent” is not English. It is, however, the French word for “hundred” :) As I don't have edit rights, could someone edit the question and title so that it makes sense?
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F'xJan 22 '11 at 14:30

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By the way, user113, sometimes less is more. It may simply be better from a stylistic point of view to say "I was confident" rather than "I was 100% confident."
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RobustoJan 22 '11 at 16:27

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@Jim Oke: Cent means one thing in English; a division of currency/coin. It is plain incorrect to say "cent percent" - perhaps the questioner can clarify what he means.
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NoldorinJan 22 '11 at 17:08

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@Jimi: You should have said that originally! You just confused me initially hah, but I see your point now. Indeed, "cent percent" seems to be a peculiar term that is unique to Indian English. (It's certainly not used in British English.) Nonetheless, it's probably valid in the dialect relevant to the user, so I've rolled back my edit and added the tag indian-english. :)
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NoldorinJan 22 '11 at 18:04

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Though he seems to be writing for Americans, in which case it's best to use U.S. English...
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NoldorinJan 22 '11 at 18:05

3 Answers
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I would substitute an adjective that means the same thing: totally, completely, absolutely, etc.

As it stands, though, your question makes no sense: "cent percent" is meaningless. Are you asking whether you should spell out "one hundred percent" instead of using numerals? If so, it probably doesn't make a lot of difference. Still, in the context I would use one of the adjectives I suggested here.